| 摘要 |
PURPOSE:To simplify the structure of a water-cooled wall and the duct of a combustion chamber to facilitate the manufacture thereof and to decrease the cost therefore by dividing two-stage combustion air holes of the combustion chamber into several parts and dividing and supplying two-stage combustion air from the air holes into the upstream and the downstream of combustion gas. CONSTITUTION:Several two-stage combustion air holes 3 are provided laterally at the upper part of an upermost burner 2 in a suitable distance. Respective lateral two-stage combustion air holes 3 are divided at the upper and lower parts, and divided air holes 3a and 3b have such a structure that the stream of two-stage combustion air assumes the forms shown by solid lines and oblique lines. By the multistage, two-stage combustion air holes 3, the two-stage combustion air can be divided and supplied to the upstream and the downstream of the combustion gas generated from the pulverized coal combustion by the burner 2 of a boiler combustion chamber 1, and reduction of NOx and C in the substantially same degree as the case of providing ordinary two-stage combustion air holes at the upper and lower stages can be effected. |
